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Microwave Teaching and Research at Northumbria University

Microwave Teaching and Research at Northumbria University. Prof. David Smith School of Computing, Engineering and Information Technology. Outline of Presentation. How do microwaves fit in Facilities within School Microwave Research Outline Details on Microwave Holography

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Microwave Teaching and Research at Northumbria University

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  1. Microwave Teaching and Research at Northumbria University Prof. David Smith School of Computing, Engineering and Information Technology

  2. Outline of Presentation • How do microwaves fit in • Facilities within School • Microwave Research Outline • Details on Microwave Holography • Results of Microwave Holography

  3. How do Microwaves fit in ? • Undergraduate courses • B. Eng. Hons. CE 1 20 Point unit final yr, • 40 Point final yr individual project • B. Sc Hons. MCT 1 20 Point unit final yr • Post Graduate Taught Courses • M. Sc Opto and Comms 1 10 Point unit • 80 Point individual project • Research Students • 5 Ph. D. Full Time Students

  4. New Facilities within School • Agilent sponsored Microwave Research Laboratory • Agilent sponsored Microwave Teaching Laboratory • Agilent sponsored Opto and RF Research Laboratory

  5. Microwave Research / Teaching Facilities • Hardware – Major Items • Vector Analysis • PNA to 50 GHz, PNA to 40 GHz, Old VNA • NSI Near Field Antenna Measurement System • Spectrum Analysis, to 26.5 GHz • Synthesised sources, 50 GHz, 40 GHz, 20 GHz • Vector Signal Generator to 6 GHz • Dielectric Measurement Kit

  6. Microwave Research / Teaching Facilities • Software • Concerto - Full 3D EM simulator • Microstripes – Full 3D EM simulator • Genesys Microwave Design Software • General Mathematical Software • Mathcad, MATLAB • Labview for automatic control

  7. RF / Microwave Research Personnel • 4 Full Time Academic Staff ( Teaching ) • 2 Visiting Professors • 1 Visiting Fellow • 2 Post Doc Researchers • 5 Post Graduate Researchers • ( Full time Ph. D. students )

  8. Areas of Research • Main areas • Linear Amplification using Non-Linear Components ( LINC ) • Microwave holography • Other areas

  9. Linear Amplification using Non-Linear Components ( LINC ) • Allow high efficiency non-linear amps to be used • Divide signal into in-phase and quadrature components • Amplify • In-phase signals add - quadrature signals subtract

  10. Microwave Holography • Similar to Optical Holography • Only measure Intensity – inexpensive • Called Hologram • Have developed techniques for doing this at microwave frequencies • Can reconstruct Complex Field from hologram • Can use this information to obtain 3D images

  11. Holography Outline • Combine coherent scattered wave and reference wave • Phase difference appears as change in intensity • ( Hologram ) • Illuminate with original reference wave to reconstruct complex field • As phase is recovered we can get 3D image

  12. Applying Holography • We have successfully applied these techniques in a number of areas • Microwave Antenna Testing • Security Imaging • Medical Imaging

  13. Antenna Testing • Change conventional near field testing using Vector Analyser • Measure Holographic Intensity Patterns • Don’t need Vector Analyser, just a power meter • Can use same mathematical techniques to find far field radiation patterns • Can reconstruct aperture fields for antennas

  14. Antenna Testing • Holographic Near Field Testing System

  15. Antenna Testing • Adaptation of Conventional Near Field Testing Techniques

  16. Antenna Testing Results • Parabolic dish antenna far field radiation patterns

  17. Security Imaging • Only record Intensity • Quick and Cheap • Can reconstruct Magnitude and Phase of original scattered wave • Can use magnitude information to detect metallic objects • Need Phase information to detect non-metallic objects • Plastic explosives

  18. Security Imaging • Holographic Images of Gun cut-out • Left – Magnitude Right - Phase

  19. Security Imaging Magnitude Phase • Magnitude and Phase reconstructions of simulated plastic explosive

  20. Medical Imaging • Non-ionising imaging offers advantages over X-ray mammography • High contrast ratio between healthy and malignant tissue • Ability to resolve small targets • Good penetration into tissue • No health risk

  21. Medical Imaging – Experimental System

  22. Medical Imaging

  23. Conclusions • Outlined facilities for Microwave Research • Outlined areas of research • Outlined areas of application for microwave imaging • Presented results for these areas • Interested in developing these techniques for other areas

  24. Thank You

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